Fastener driving tool using a gas spring

CAFC
  • US 8,267,296 B2
  • Filed: 08/09/2011
  • Issued: 09/18/2012
  • Est. Priority Date: 10/05/2007
  • Status: Active Grant
First Claim
Patent Images

1. A fastener driving tool, comprising:

  • (a) a guide body that has a receiving end, an exit end, and a passageway therebetween, said guide body being configured to receive a fastener that is to be driven from said exit end;

    (b) a driver actuation device having a movable member that creates a displacement volume;

    (c) an elongated driver member having a first end and a second end, said first end being in mechanical communication with said movable member of the driver actuation device, said second end being sized and shaped to push a fastener from said exit end of the guide body through at least a portion of said passageway of the guide body, and said driver member having at least one longitudinal edge with a plurality of spaced-apart protrusions;

    (d) a lifter member which exhibits a contact surface that, at predetermined locations along said contact surface, makes contact with said plurality of spaced-apart protrusions of said driver member such that, when said lifter member is moved in a first direction, it causes a return stroke of an operating cycle and moves said driver member from a driven position toward a ready position, and when said lifter member is moved to a holding position, it temporarily holds said driver member at said ready position by use of a holding contact between said lifter member and said driver member; and

    (e) a main storage chamber that is in fluidic communication with said displacement volume of the driver actuation device, wherein;

    (i) said main storage chamber and said displacement volume are charged with a pressurized gas,(ii) when actuated for a driving stroke of said operating cycle, said lifter member moves in said first direction from said holding position and releases said driver member from said holding contact, and said movable member of the driver actuation device is moved by said pressurized gas and moves said driver member from said ready position to said driven position, and(iii) said pressurized gas is not exhausted to atmosphere after said driving stroke, but instead is re-used for a plurality of said operating cycles;

    (f) an energy source used for causing movement of said lifter member; and

    (g) a housing that substantially contains said driver actuation device, said elongated driver member, said lifter member, and said main storage chamber, with no external energy source cable and no external hose.

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